#include <u.h>#include <libc.h>#include <ctype.h>#include <bio.h>#include "authcmdlib.h" /* * get the date in the format yyyymmdd */Tmgetdate(char *d){	Tm date;	int i; 	date.year = date.mon = date.mday = 0;	date.hour = date.min = date.sec = 0;	for(i = 0; i < 8; i++)		if(!isdigit(d[i]))			return date;	date.year = (d[0]-'0')*1000 + (d[1]-'0')*100 + (d[2]-'0')*10 + d[3]-'0';	date.year -= 1900;	d += 4;	date.mon = (d[0]-'0')*10 + d[1]-'0' - 1;	d += 2;	date.mday = (d[0]-'0')*10 + d[1]-'0';	date.yday = 0;	return date;} longgetexpiration(char *db, char *u){	char buf[Maxpath];	char prompt[128];	char cdate[32];	Tm date;	ulong secs, now;	int n, fd; 	/* read current expiration (if any) */	snprint(buf, sizeof buf, "%s/%s/expire", db, u);	fd = open(buf, OREAD);	buf[0] = 0;	if(fd >= 0){		n = read(fd, buf, sizeof(buf)-1);		if(n > 0)			buf[n-1] = 0;		close(fd);	} 	if(buf[0]){		if(strncmp(buf, "never", 5)){			secs = atoi(buf);			memmove(&date, localtime(secs), sizeof(date));			snprint(buf, sizeof buf, "%4.4d%2.2d%2.2d",				date.year+1900, date.mon+1, date.mday);		} else			buf[5] = 0;	} else		strcpy(buf, "never");	snprint(prompt, sizeof prompt,		"Expiration date (YYYYMMDD or never)[return = %s]: ", buf); 	now = time(0);	for(;;){		readln(prompt, cdate, sizeof cdate, 0);		if(*cdate == 0)			return -1;		if(strcmp(cdate, "never") == 0)			return 0;		date = getdate(cdate);		secs = tm2sec(&date);		if(secs > now && secs < now + 2*365*24*60*60)			break;		print("expiration time must fall between now and 2 years from now\n");	}	return secs;}